Minor modification in docs. Fix spring-atticgh-410.

docs/src/main/asciidoc/spring-cloud-aws.adoc

@@ -1130,10 +1130,9 @@ annotations. `@Header` is used to inject a specific header value while `@Headers
 containing all headers.
 
 Only the link:https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_Message.html[standard
-message attributes] sent with an SQS message are fully supported. Custom attributes are handled only partially.
-Custom message attribute value is resolved only by using mandatory type part without custom label (type name without label after '.')
-Custom type label is skipped during conversion to header value.
-(You can still access original message and custom labels using `sourceData` message header)
+message attributes] sent with an SQS message are fully supported.
+Custom message attribute are handled as if custom type label (everything after '.' in type name) wasn't present in attribute key.
+It is silently omitted during conversion, but still can be accessed as long as original message is present in 'sourceData' header.
 
 In addition to the provided argument resolvers, custom ones can be registered on the
 `aws-messaging:annotation-driven-queue-listener` element using the `aws-messaging:argument-resolvers` attribute (see example below).